Markets fell on Friday.
The S&P 500 fell 0.6 percent, the STOXX Europe 600 fell 0.7 percent and the Nikkei 225 fell 0.3 percent.
US crude oil fell 4 percent.
Some think the decline willl be short-lived.
Peter Tuchman, a floor broker at the New York Stock Exchange for Quattro M Securities, said the decline on Friday was just a breather after “a big move the last two days”.
“Businesses are still growing revenues, expanding margins, improving productivity and raising dividends, and at the end of the day that determines stock prices,” said Doug Foreman, chief investment officer of Kayne Anderson Rudnick Investment Management.
However, Dan Suzuki, Bank of America Merrill Lynch's senior US equity investment strategist, is cautious on stocks. He told CNBC on Friday that indices that track surprises in economic data “have been rolling over pretty hard since” last July.